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Linux/drivers/mfd/ab3100-otp.c

  1 /*
  2  * drivers/mfd/ab3100_otp.c
  3  *
  4  * Copyright (C) 2007-2009 ST-Ericsson AB
  5  * License terms: GNU General Public License (GPL) version 2
  6  * Driver to read out OTP from the AB3100 Mixed-signal circuit
  7  * Author: Linus Walleij <linus.walleij@stericsson.com>
  8  */
  9 
 10 #include <linux/module.h>
 11 #include <linux/kernel.h>
 12 #include <linux/slab.h>
 13 #include <linux/init.h>
 14 #include <linux/platform_device.h>
 15 #include <linux/mfd/abx500.h>
 16 #include <linux/debugfs.h>
 17 #include <linux/seq_file.h>
 18 
 19 /* The OTP registers */
 20 #define AB3100_OTP0             0xb0
 21 #define AB3100_OTP1             0xb1
 22 #define AB3100_OTP2             0xb2
 23 #define AB3100_OTP3             0xb3
 24 #define AB3100_OTP4             0xb4
 25 #define AB3100_OTP5             0xb5
 26 #define AB3100_OTP6             0xb6
 27 #define AB3100_OTP7             0xb7
 28 #define AB3100_OTPP             0xbf
 29 
 30 /**
 31  * struct ab3100_otp
 32  * @dev containing device
 33  * @locked whether the OTP is locked, after locking, no more bits
 34  *       can be changed but before locking it is still possible
 35  *       to change bits from 1->0.
 36  * @freq clocking frequency for the OTP, this frequency is either
 37  *       32768Hz or 1MHz/30
 38  * @paf product activation flag, indicates whether this is a real
 39  *       product (paf true) or a lab board etc (paf false)
 40  * @imeich if this is set it is possible to override the
 41  *       IMEI number found in the tac, fac and svn fields with
 42  *       (secured) software
 43  * @cid customer ID
 44  * @tac type allocation code of the IMEI
 45  * @fac final assembly code of the IMEI
 46  * @svn software version number of the IMEI
 47  * @debugfs a debugfs file used when dumping to file
 48  */
 49 struct ab3100_otp {
 50         struct device *dev;
 51         bool locked;
 52         u32 freq;
 53         bool paf;
 54         bool imeich;
 55         u16 cid:14;
 56         u32 tac:20;
 57         u8 fac;
 58         u32 svn:20;
 59         struct dentry *debugfs;
 60 };
 61 
 62 static int __init ab3100_otp_read(struct ab3100_otp *otp)
 63 {
 64         u8 otpval[8];
 65         u8 otpp;
 66         int err;
 67 
 68         err = abx500_get_register_interruptible(otp->dev, 0,
 69                 AB3100_OTPP, &otpp);
 70         if (err) {
 71                 dev_err(otp->dev, "unable to read OTPP register\n");
 72                 return err;
 73         }
 74 
 75         err = abx500_get_register_page_interruptible(otp->dev, 0,
 76                 AB3100_OTP0, otpval, 8);
 77         if (err) {
 78                 dev_err(otp->dev, "unable to read OTP register page\n");
 79                 return err;
 80         }
 81 
 82         /* Cache OTP properties, they never change by nature */
 83         otp->locked = (otpp & 0x80);
 84         otp->freq = (otpp & 0x40) ? 32768 : 34100;
 85         otp->paf = (otpval[1] & 0x80);
 86         otp->imeich = (otpval[1] & 0x40);
 87         otp->cid = ((otpval[1] << 8) | otpval[0]) & 0x3fff;
 88         otp->tac = ((otpval[4] & 0x0f) << 16) | (otpval[3] << 8) | otpval[2];
 89         otp->fac = ((otpval[5] & 0x0f) << 4) | (otpval[4] >> 4);
 90         otp->svn = (otpval[7] << 12) | (otpval[6] << 4) | (otpval[5] >> 4);
 91         return 0;
 92 }
 93 
 94 /*
 95  * This is a simple debugfs human-readable file that dumps out
 96  * the contents of the OTP.
 97  */
 98 #ifdef CONFIG_DEBUG_FS
 99 static int ab3100_show_otp(struct seq_file *s, void *v)
100 {
101         struct ab3100_otp *otp = s->private;
102 
103         seq_printf(s, "OTP is %s\n", otp->locked ? "LOCKED" : "UNLOCKED");
104         seq_printf(s, "OTP clock switch startup is %uHz\n", otp->freq);
105         seq_printf(s, "PAF is %s\n", otp->paf ? "SET" : "NOT SET");
106         seq_printf(s, "IMEI is %s\n", otp->imeich ?
107                    "CHANGEABLE" : "NOT CHANGEABLE");
108         seq_printf(s, "CID: 0x%04x (decimal: %d)\n", otp->cid, otp->cid);
109         seq_printf(s, "IMEI: %u-%u-%u\n", otp->tac, otp->fac, otp->svn);
110         return 0;
111 }
112 
113 static int ab3100_otp_open(struct inode *inode, struct file *file)
114 {
115         return single_open(file, ab3100_show_otp, inode->i_private);
116 }
117 
118 static const struct file_operations ab3100_otp_operations = {
119         .open           = ab3100_otp_open,
120         .read           = seq_read,
121         .llseek         = seq_lseek,
122         .release        = single_release,
123 };
124 
125 static int __init ab3100_otp_init_debugfs(struct device *dev,
126                                           struct ab3100_otp *otp)
127 {
128         otp->debugfs = debugfs_create_file("ab3100_otp", S_IFREG | S_IRUGO,
129                                            NULL, otp,
130                                            &ab3100_otp_operations);
131         if (!otp->debugfs) {
132                 dev_err(dev, "AB3100 debugfs OTP file registration failed!\n");
133                 return -ENOENT;
134         }
135         return 0;
136 }
137 
138 static void __exit ab3100_otp_exit_debugfs(struct ab3100_otp *otp)
139 {
140         debugfs_remove(otp->debugfs);
141 }
142 #else
143 /* Compile this out if debugfs not selected */
144 static inline int __init ab3100_otp_init_debugfs(struct device *dev,
145                                                  struct ab3100_otp *otp)
146 {
147         return 0;
148 }
149 
150 static inline void __exit ab3100_otp_exit_debugfs(struct ab3100_otp *otp)
151 {
152 }
153 #endif
154 
155 #define SHOW_AB3100_ATTR(name) \
156 static ssize_t ab3100_otp_##name##_show(struct device *dev, \
157                                struct device_attribute *attr, \
158                                char *buf) \
159 {\
160         struct ab3100_otp *otp = dev_get_drvdata(dev); \
161         return sprintf(buf, "%u\n", otp->name); \
162 }
163 
164 SHOW_AB3100_ATTR(locked)
165 SHOW_AB3100_ATTR(freq)
166 SHOW_AB3100_ATTR(paf)
167 SHOW_AB3100_ATTR(imeich)
168 SHOW_AB3100_ATTR(cid)
169 SHOW_AB3100_ATTR(fac)
170 SHOW_AB3100_ATTR(tac)
171 SHOW_AB3100_ATTR(svn)
172 
173 static struct device_attribute ab3100_otp_attrs[] = {
174         __ATTR(locked, S_IRUGO, ab3100_otp_locked_show, NULL),
175         __ATTR(freq, S_IRUGO, ab3100_otp_freq_show, NULL),
176         __ATTR(paf, S_IRUGO, ab3100_otp_paf_show, NULL),
177         __ATTR(imeich, S_IRUGO, ab3100_otp_imeich_show, NULL),
178         __ATTR(cid, S_IRUGO, ab3100_otp_cid_show, NULL),
179         __ATTR(fac, S_IRUGO, ab3100_otp_fac_show, NULL),
180         __ATTR(tac, S_IRUGO, ab3100_otp_tac_show, NULL),
181         __ATTR(svn, S_IRUGO, ab3100_otp_svn_show, NULL),
182 };
183 
184 static int __init ab3100_otp_probe(struct platform_device *pdev)
185 {
186         struct ab3100_otp *otp;
187         int err = 0;
188         int i;
189 
190         otp = devm_kzalloc(&pdev->dev, sizeof(struct ab3100_otp), GFP_KERNEL);
191         if (!otp) {
192                 dev_err(&pdev->dev, "could not allocate AB3100 OTP device\n");
193                 return -ENOMEM;
194         }
195         otp->dev = &pdev->dev;
196 
197         /* Replace platform data coming in with a local struct */
198         platform_set_drvdata(pdev, otp);
199 
200         err = ab3100_otp_read(otp);
201         if (err)
202                 return err;
203 
204         dev_info(&pdev->dev, "AB3100 OTP readout registered\n");
205 
206         /* sysfs entries */
207         for (i = 0; i < ARRAY_SIZE(ab3100_otp_attrs); i++) {
208                 err = device_create_file(&pdev->dev,
209                                          &ab3100_otp_attrs[i]);
210                 if (err)
211                         goto err;
212         }
213 
214         /* debugfs entries */
215         err = ab3100_otp_init_debugfs(&pdev->dev, otp);
216         if (err)
217                 goto err;
218 
219         return 0;
220 
221 err:
222         while (--i >= 0)
223                 device_remove_file(&pdev->dev, &ab3100_otp_attrs[i]);
224         return err;
225 }
226 
227 static int __exit ab3100_otp_remove(struct platform_device *pdev)
228 {
229         struct ab3100_otp *otp = platform_get_drvdata(pdev);
230         int i;
231 
232         for (i = 0; i < ARRAY_SIZE(ab3100_otp_attrs); i++)
233                 device_remove_file(&pdev->dev,
234                                    &ab3100_otp_attrs[i]);
235         ab3100_otp_exit_debugfs(otp);
236         return 0;
237 }
238 
239 static struct platform_driver ab3100_otp_driver = {
240         .driver = {
241                 .name = "ab3100-otp",
242                 .owner = THIS_MODULE,
243         },
244         .remove  = __exit_p(ab3100_otp_remove),
245 };
246 
247 module_platform_driver_probe(ab3100_otp_driver, ab3100_otp_probe);
248 
249 MODULE_AUTHOR("Linus Walleij <linus.walleij@stericsson.com>");
250 MODULE_DESCRIPTION("AB3100 OTP Readout Driver");
251 MODULE_LICENSE("GPL");
252 

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